Lars Gustäbel <l...@gustaebel.de> added the comment:

This behaviour is intentional. A tar archive does not contain a central 
directory structure, it is just a chain of files. As a side-effect it is 
possible to have multiple files with the same name in one archive, e.g. when 
append mode was used. That's why the archive must be scanned from the beginning 
to the end as soon as you reference an archive member by its name.
The best way to deal with this issue in my opinion is to improve the 
documentation for the stream interface.

----------
assignee:  -> lars.gustaebel
nosy: +lars.gustaebel
priority: normal -> low
versions: +Python 3.1, Python 3.2, Python 3.3

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10436>
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